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DEFINED BENEFIT PLAN - Net periodic benefit costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Components of net periodic expense:        
Interest cost $ 185 $ 187 $ 551 $ 551
Expected return on assets (196) (203) (585) (600)
Amortization of prior loss (36) (39) (106) (114)
Net periodic expense $ (47) $ (55) $ (140) $ (163)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] General and Administrative Expense General and Administrative Expense General and Administrative Expense General and Administrative Expense